| Model | χ2 Statistic | p-value |
| FEV1 | 3.2 | 0.08 |
| DLCO | 2.9 | 0.09 |
| KCO | 3.5 | 0.07 |
| PD-15 | 3.8 | 0.06 |
| HU-950 | 3.1 | 0.08 |
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